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Chapter 1 Flashcards

City of Chicago boiler exam (78 cards)

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1
Q

Cast iron boiler stacked up in pieces is called?

A

Horizontal sectional

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2
Q

Boilers to a common header operating at 50 PSI each. The master gauge manifold would read what?

A

50 PSI

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3
Q

A safety valve is set to pop at above what MAWP?

A

5psi

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4
Q

Periodically, a bucket of water should be poured down a floor drain. Why?

A

To prevent gases from escaping

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5
Q

The last alarm to go before a vertical tube broilers tube melt?

A

Fusible plug

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6
Q

What operations does not require purging?

A

Low water cut off

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7
Q

In an electric boiler, water is heated by electrodes by?

A

Electric flow through water

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8
Q

To prevent a fire, what should you remove from the boiler room?

A

Oily rags

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9
Q

When installing an Hg pressure gauge, what should be done for proper operation?

A

Must be installed horizontally

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10
Q

When gas is heated to double its temperature what happens?

A

The volume doubles

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11
Q

All the following are advantages of natural gas except?

A

Needs little air to no air

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12
Q

What is installed in a feed water tank to prevent sludge from entering the boiler?

A

Blow down valve

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13
Q

In a low pressure boiler, how are the fittings made?

A

Made per ASME code based on each different type

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14
Q

What controls combustion efficiency?

A

Draft

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15
Q

All are unsafe practices by an operator when shutting down, except?

A

Venting before opening a man hole

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16
Q

All are unsafe practices by an operator when shutting down, except?

A

Venting before opening the man hole

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17
Q

What replaced staybolts in a water tube boiler?

A

Sinuous headers

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18
Q

When starting up a cold boiler, everything is true except?

A

Main steam stop valve should be open

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19
Q

If a centrifugal pump is cavitating, what would cause the damage?

A

Vibration

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20
Q

In a water tube boiler the gases of combustion pass, where?

A

Around the tubes

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21
Q

When steam is heated it’s volume does what?

A

Stays the same

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22
Q

Air that controls the rate of combustion efficiency is what?

A

Primary

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23
Q

How fo you test for flame failure?

A

Cover the infrared scanner eye

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24
Q

A duty that is not part of the boilers operators

A

Inspecting the boiler

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25
To eliminate the danger of an explosion during start up
Firing sequence must allow for purging
26
When blowing down a boiler with a quick opening and screw type valve
Quick opening is opened first and closed last
27
What is sensitive to change in steam flow and pressure?
The metering combustion control
28
What does the term "drop a plug" mean?
Fusible plug has melted (last low water alarm)
29
Ratio of heat supplied in fuel to heat absorbed by water
Thermal efficiency
30
Main function of water column?
Reduce turbulence
31
A boiler operating at 14psi is what?
Low pressure
32
In a low pressure, what should never be placed between the safety relief valve and the boiler?
Shut off valve
33
Water and foam extinguishers should be used in what type of fires?
Type A fire
34
Which is the best way to vent low pressure boiler which does not have a air vent?
With the try cocks (top one)
35
If the top line gauge glass is blocked the gauge glass will what?
Fill up with water and give a false reading.
36
Before removing a handhole, the operator must make sure what?
That there is no vacuum in the boiler
37
Steam separators do all of the following except?
Increase steam temperature
38
For blow down operations, the most important fitting is what?
Blow down valve
39
The most important fitting on a boiler is what?
Safety valve
40
The means of deciding frequency of a blow down.
Water analysis
41
A low pressure gas system is safer than a high pressure gas system because?
Less possibilities of leaks
42
A cause of over heating boiler tubes is?
Scale formation
43
Steam expands approximately how many times as it turns from water to steam at 14.7 PSIA?
1600 times
44
What accidents must be logged?
Any and all accidents
45
Who do you notify when you have an emergency in the boiler room?
Chief or lead shift engineer
46
When bringing a low pressure boiler online, what must a operator must NEVER do before opening a steam/ water valve?
Allow the steam side to cool down
47
Why must an operator wear safety goggles when inspecting a flame?
Protection from UV rays
48
When working inside a boiler what must be present?
Another person outside the boiler
49
When burning pulverized coal, the fire box is in what type of pressure?
Negative pressure
50
When too much oxygen is in the feed water, what may occur?
Scaling
51
Can steam be superheated in a low pressure boiler?
Yes
52
By switching leads on a motor, you can reverse the direction only in what phase motor?
3 phase
53
How many blow down valves are required on a boiler operating above 100psi?
2
54
What type valve should be used for throttling services
Globe valve
55
A water fire extinguisher should be used on what class fires?
A
56
A high pressure boiler is not normally used in what type of application?
Residential
57
Natural draft is produced by what?
Chimney
58
The manual reset valve will not reset unless, what?
The pilot flame has been produced
59
When fuel is burned using only the minimum of excess air, it is called what?
Complete combustion
60
Most furnace explosions at start up are caused by what?
Not pre-purging
61
A stream pressure gauge should have a range NOT LESS than what?
1 1/2 the safety valve settings
62
Caustic embrittlement is most often found where?
At the end of the tubes
63
What is class A fire?
Wood and paper
64
What does a microprocessor burner control do?
Starts and stops the boiler
65
In order to produce one pound of steam, how many pounds of water must be evaporated?
1
66
When installing a new gauge glass you should allow what size clearance?
1/4 inch
67
Boiler tubes are measured by the inside or outside diameter?
Outside
68
The dry pipe is located in the?
Upper part of the steam and water drum
69
Secondary air controls the?
Combustion efficiency
70
What is the practical way to tell what the max pressure for a safety valve is
Manufacturers chart
71
Positioning and pneumatic control systems need what to operate properly?
Clean, dry air
72
What condition is least likely to happen on a worn modulating linkage?
Slow response time
73
What is the most correct statement regarding what an operator must do while working on a laid up boiler?
Remove any locks and tags
74
What do you do when a boiler goes into flame failure?
Secure and purge
75
Using completley purified water is or is not suitable for electric boilers?
Not suitable
76
What valve gives the least resistance to flow?
OS&Y gate valve
77
What is the transfer of heat when it moves from molecule to molecule?
Conduction
78
All are true of Scotch marine boilers except what?
Low cost start up

Boiler Prep (1 decks)

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